Waterproofing material and process for making the same



UNITED STATES PATENT OFFICE.

" ma .Ii'uar, on NEW YORK, n. Y.

.wamraoorme rnocnss ron IAKING in: sun

Be it known'that I, HENRI V a citizen of the United States, and resident of New York city, in the county of Newi York and State of New York, have-invented certain new and useful Improvements in Waterproofing Materials and Processes for Making the Same, of which the following is a specification. y It has been known to utilize-sulfite waste liquor'one form of which is described in the patent to Robeson, No. 833,634, March 12, 1906 and known under the commercial name of glutrin as a binding material and as a tannin extract. As illustration of such use it is incorporated in sand cores in foundry practice, in the formation of briquets, as a binding material for roads disclosed in the patent to Robeson, No, 1,069,029, July 29, 1913 and to, form plastic clayey com ositions such as is disclosed in the patent to obeson, No. 1,069,031, July 29, 1913. These binding materials and extracts are not waterproof and this seriously detracts from their commercial value in that the resulting structures bound by this material absorb water with a resulting tendency to become pasty and eventually to disintegrate.

Accordingly, the primary ob'ect of theinvention is to provide a simpli ed and commercially practical means for rendering th1s sulfite waste liquor material waterproof without impairing its efficiency as a binding material.

It has been suggested to combine rosin with caustic soda and add the resulting soapy composition to the sulfite waste liquor. This process, however, does not work efficiently in that the 'waterproofing of the binding material is not materially improved. As an improvement over this su gestion the present disclosure features the introduction of the rosin, or preferably linseed oil, into chemical combination with the caustic soda whilethe latter is in contact with the waste liquor. It is the present belief that the rosin or linseed oil in its reaction with the caustic soda can combine with the sulfite waste liquor while in. a nascent state and this As an example of one process which has workedeifectively in producing a binding 9 -material substantially waterproof, the following steps are practised :e n

- p (a) The sufite waste liquor is treated with Hicks HURT,

I Specification Letters Patent. Patented 15 1 2 1,400,164. 7 no Drawing. Application filed November 27, 1918. Serial No. 264,442. I To all whom it may concern a re-agent to remove all or practically all of the contained lime.

This may be attained by treating the liquor with sulfuric acid or preferably with sodium bi-sulfate. The use of the sodium salt is preferable for its use does not neces- I (a) The filtrate is neutralized withan alkali, preferably caustic soda.

) To the neutralized substance is added a solution of caustic soda in an amount de-- pending upon the desired reaction and condition of the re-agents, for example in the proportion of six (6) .parts by, weight of caustic sodato one hundred (100) parts by Wei ht of the soda base material.

here is thus formed a solvent for the material added by the next step and this solvent is heated to insure its homogeneity.

(e) To the hot solvent is added a substance. which is saponifiable with caustic soda, one such substance bein rosin as previously suggested, but linsee -oil has preference in t price of linseed-oil is not objectionable. However, it is to be understood that other substances are equally applicable and in the following claims the term linseed-oil is to be understood to include any equivalent substance, such as rosin, corn oil, china nut oil which will saponif with soda. The linseed-oil is added in t e proportion of fifty 50) parts of the oil to onehundred and six 106) parts of the oil solvent. The linseedoil or rosin unites with the soda and simultaneously unites also with the sulfite liquor filtrate to form a solution which can be diluted with water in all proportions and which on dryin forms awaterproof binder.

(f) Preferab y and prior to the formation of the watersolution the saponified substance is treated with a re-agent capable of setting the linseed-oil or rosin free.

'Onesuch substance which has been used satisfactorily is aluminum sulfate'but certain acids, such for instance, as sulfuric acid can be used, Th'ealuminum sulfate is dissolved in hot water inthe proportion of fourteen (14) parts by weight of the sulfate to ose situations where the high one hundred aid fifty; parts of the The material can be marketed and used as binding materials are used at present. The use of this waterproof substance as a filler in the tannin treatment of leather and the like'has been suggested.

Having claim:-- q a 1. The'process of preparing a substantially waterproofin prises treating a su te waste liquor with a re-agent to precipitate therefrom the icon-- tained lime, filtering, neutralizing the-" 514 trate, adding caustic soda to'ithe neutralized tiallywaterproofin 1 material which com-- ,tially waterproofin filtrate and then adding to the solution thus formed a substance capable of saponification v with the sodium compound.

2. The process of preparing a substanprises treating a su fite waste liquor-with a re-agent to precipitate therefrom the oontained lime, filtering, neutralizing the fil-- trate, addin caustic soda to the neutralized filtrate, addlng to the solution thus formeda substance capable of saponifyin with the sodium compound and adding to t e saponified mass a re-agent capable' of setting free the said saponifiedsubstance.

3. 'In the art of forming a waterproofing material, the process whichfcomprises treating sulfite waste-liquid with a' re-agent to precipitate therefrom j the contained lime, neutralizing the filtrate and thenadding caustic. soda to thev neutralizedfiltrateto form a solvent forlinseed oil... 1

4. The process of preparing a substanprises treating a s fite waste liquor with a a re-agent 'to precipitate therefrom the contained lime, filtering, neutralizing the filmaterialv which comi-v material which com trate with an excess of caustic soda to form a linseed oil solvent and adding linseed oil to the solvent whereby. the linseed oil will react with the excess'of caustic soda in the presence of the sulfite waste liquor. thus described my, invention, 1'

' Y i l ing material whichcomprises' the treating of 5; The process of preparing a waterproof- I saponifyi ng reaction while in intimate physical and chemical association with the waste li uor.

In the art of forming a substantially waterproof binding material, the process which'comprises sub'ectin' a neutral sulfite waste liquid free rom .llme to the action of linseed oilunder conditions which will cause the linseed oil to react with the liquor.

8. A com osition of matter containing a neutral sul te waste liquor free from lime and the soap resultingfrom the saponification of linseed oil with caustic soda.

'saponified with linseed oil in the presence of the sulfite waste liquor.

Signed at New York, in the county of New York and State of New York this 23rd day of November A. D. 1918.

- HENRY HICKS HURT. 

